The string matched by the last successful pattern match (not counting any matches hidden within a BLOCK or eval()
enclosed by the current BLOCK).
The use of this variable anywhere in a program imposes a considerable performance penalty on all regular expression matches. To avoid this penalty, you can extract the same substring by using "@-". Starting with Perl 5.10, you can use the /p
match flag and the ${^MATCH}
variable to do the same thing for particular match operations.
This variable is read-only and dynamically-scoped.
Mnemonic: like &
in some editors.